7321081 has 2 divisors, whose sum is σ = 7321082. Its totient is φ = 7321080.

The previous prime is 7321073. The next prime is 7321091. The reversal of 7321081 is 1801237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 1915456 = 2325^2 + 1384^2 .

It is an emirp because it is prime and its reverse (1801237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7321081 - 2³ = 7321073 is a prime.

It is a super-2 number, since 2×7321081² = 107196454017122, which contains 22 as substring.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (7321031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3660540 + 3660541.

It is an arithmetic number, because the mean of its divisors is an integer number (3660541).

Almost surely, 2^7321081 is an apocalyptic number.

It is an amenable number.

7321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7321081 is an equidigital number, since it uses as much as digits as its factorization.

7321081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 7321081 is about 2705.7496188672. The cubic root of 7321081 is about 194.1742951274.

The spelling of 7321081 in words is "seven million, three hundred twenty-one thousand, eighty-one".